Minor fix for reading grayscale images
Fixed byte ordering for 16-bit/channel PPM files
Continued ANSIfication, and other fixes and clarifications.
Added grouping parens to reduce ambiguity warnings.
Macros for setting binary file mode. Replacing MSDOS by _WIN32.
Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
added -s and -b options for greyscale and high-precision output
Added new ID to first line of header and changed use of formatval
minor compiler warning fixes
renamed gamma to avoid math library conflict
Removed problematic math function declarations
Changes for PC port
eliminated atof declarations for NeXT
updated revision number for release 2.0
Improved handling of scanline ordering
Initial revision
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